ascension: src/context.c@e3cacdd636e4

     1 /*

     2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

     3  * Copyright 2023 Mike Becker. All rights reserved.

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions are met:

     7  *

     8  *   1. Redistributions of source code must retain the above copyright

     9  *      notice, this list of conditions and the following disclaimer.

    10  *

    11  *   2. Redistributions in binary form must reproduce the above copyright

    12  *      notice, this list of conditions and the following disclaimer in the

    13  *      documentation and/or other materials provided with the distribution.

    14  *

    15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

    16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    18  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

    19  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

    20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

    21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

    22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

    23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

    24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

    25  * POSSIBILITY OF SUCH DAMAGE.

    26  */

    28 #include "ascension/context.h"

    29 #include "ascension/error.h"

    30 #include "ascension/utils.h"

    32 #include <SDL2/SDL.h>

    33 #include <SDL2/SDL_ttf.h>

    35 #include <time.h>

    37 AscContext asc_context;

    39 static uint64_t asc_nanos(void) {

    40     struct timespec ts;

    41     clock_gettime(CLOCK_MONOTONIC, &ts);

    42     return 1000000000ull*(uint64_t)ts.tv_sec + (uint64_t)ts.tv_nsec;

    43 }

    45 void asc_context_initialize(void) {

    46     if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED))

    47         return;

    48     memset(&asc_context, 0, sizeof(AscContext));

    50     // initialize error buffer

    51     cxBufferInit(

    52             &asc_context.error_buffer,

    53             NULL,

    54             256,

    55             NULL,

    56             CX_BUFFER_AUTO_EXTEND

    57     );

    59     // initialize SDL

    60     if (SDL_Init(SDL_INIT_VIDEO) < 0) {

    61         asc_error(SDL_GetError());

    62     } else {

    63         if (TTF_Init() < 0) {

    64             asc_error(TTF_GetError());

    65         }

    66     }

    67     SDL_ClearError();

    68     asc_context.total_nanos = asc_nanos();

    69     asc_set_flag(asc_context.flags, ASC_FLAG_INITILIZED);

    70     asc_dprintf("Ascension context initialized.");

    71 }

    73 void asc_context_destroy(void) {

    74     for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {

    75         asc_window_destroy(&asc_context.windows[i]);

    76     }

    77     asc_font_cache_clear();

    79     // quit SDL

    80     if (TTF_WasInit())

    81         TTF_Quit();

    82     SDL_Quit();

    84     // destroy the error buffer

    85     cxBufferDestroy(&asc_context.error_buffer);

    86     asc_context.flags = 0;

    87     asc_dprintf("Ascension context destroyed.");

    88 }

    90 void asc_context_quit(void) {

    91     asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);

    92 }

    94 static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) {

    95     for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {

    96         if (asc_context.windows[i].id == id) {

    97             asc_vec2i dimensions = (asc_vec2i) {width, height};

    98             asc_context.windows[i].resized = true;

    99             asc_context.windows[i].dimensions = dimensions;

   100             return;

   101         }

   102     }

   103 }

   105 bool asc_loop_next(void) {

   106     // reset mouse motion

   107     asc_context.input.mouse_xrel = 0;

   108     asc_context.input.mouse_yrel = 0;

   110     // dispatch SDL events

   111     SDL_Event event;

   112     while (SDL_PollEvent(&event)) {

   113         switch (event.type) {

   114             case SDL_QUIT:

   115                 asc_set_flag(asc_context.flags, ASC_FLAG_QUIT);

   116                 break;

   117             case SDL_WINDOWEVENT: {

   118                 if (event.window.event == SDL_WINDOWEVENT_RESIZED)

   119                     asc_event_window_resized(

   120                             event.window.windowID,

   121                             event.window.data1,

   122                             event.window.data2

   123                     );

   124                 break;

   125             }

   126             case SDL_MOUSEMOTION: {

   127                 // accumulate relative motion

   128                 asc_context.input.mouse_xrel += event.motion.xrel;

   129                 asc_context.input.mouse_yrel += event.motion.yrel;

   130                 // update absolute position

   131                 asc_context.input.mouse_x = event.motion.x;

   132                 asc_context.input.mouse_y = event.motion.y;

   133                 break;

   134             }

   135             case SDL_KEYDOWN:

   136                 asc_context.input.keys[event.key.keysym.scancode] = true;

   137                 break;

   138             case SDL_KEYUP:

   139                 asc_context.input.keys[event.key.keysym.scancode] = false;

   140                 break;

   141         }

   142     }

   144     // sync the windows

   145     for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {

   146         if (asc_context.windows[i].id > 0) {

   147             asc_window_sync(&asc_context.windows[i]);

   148         }

   149     }

   151     // compute frame time

   152     uint64_t frame_nanos, ns;

   153     do {

   154         ns = asc_nanos();

   155         frame_nanos = ns - asc_context.total_nanos;

   156     } while (frame_nanos == 0);

   157     asc_context.frame_nanos = frame_nanos;

   158     asc_context.total_nanos = ns;

   160     return !asc_test_flag(asc_context.flags, ASC_FLAG_QUIT);

   161 }

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